CN110463331B - Random access method, device, equipment and storage medium - Google Patents
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
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Abstract
The embodiment of the application provides a random access method, a device, equipment and a storage medium, wherein the method comprises the following steps: the terminal equipment determines a second access carrier according to the information of the first access carrier which can be accessed and is indicated by the base station and a pre-acquired access carrier information list, wherein the access carrier information list comprises the information of all carriers supporting random access, and then the terminal equipment performs random access on the second access carrier. When the terminal equipment performs random access, a new second access carrier is determined in the access carrier information list according to the first access carrier known by the base station instead of randomly selecting the access carrier, and the base station can also determine the second access carrier adopted by the terminal equipment according to the indicated first access carrier so as to configure the access carriers of other terminal equipment, reduce the collision probability of the terminal equipment and other terminal equipment and avoid interfering the use of other terminal equipment.
Description
Technical Field
The present application relates to communications technologies, and in particular, to a random access method, apparatus, device, and storage medium.
Background
Currently, a terminal device of a narrowband Band-Internet of Things (NB-IoT) may initiate random access and listen for paging on multiple carriers.
The random access process is a communication flow initiated by the terminal device, and aims to establish a communication connection, acquire uplink synchronization, apply for uplink resources, and the like, and is one of the most basic and most important flows in the NB-IoT system. The initiation of the random access process is classified into several categories, for example, according to the state of the terminal device at the time of initiating the random access, the random access is classified into an idle state random access or a connection state random access. In the connection state random access, the random access is actively initiated by the terminal device and initiated by the base station through a Physical Downlink Control Channel (PDCCH) command (order). When a network uses a PDCCH command to trigger the random access of the terminal equipment, a carrier used by the terminal equipment is indicated in a signaling, and when the terminal equipment fails to try to access the carrier for a plurality of times, the coverage grade is adjusted upwards, and a new carrier supporting the coverage grade is randomly selected to retry the random access.
However, the base station usually reserves random access resources on some specific carriers, and the terminal device randomly selects a new carrier to access, for the terminal device, the collision probability that the base station reserves when the randomly selected carrier and the resources correspondingly used on the carrier cannot be guaranteed may be greatly enhanced, and the terminal device may randomly select reserved resources on other carriers, and may also cause interference to the terminal device that should use the resources.
Disclosure of Invention
The embodiment of the application provides a random access method, a random access device, equipment and a storage medium, which are used for solving the problems that a terminal device randomly selects a new carrier for access, the randomly selected carrier and correspondingly used resources on the carrier cannot be guaranteed to be reserved by a base station, and the collision probability can be greatly enhanced.
A first aspect of the present application provides a random access method, including:
the terminal equipment determines a second access carrier according to the information of the first access carrier and a pre-acquired access carrier information list; the first access carrier is a carrier which is indicated by a base station and is accessed by the terminal equipment, and the access carrier information list comprises information of carriers supporting random access;
and the terminal equipment carries out random access on the second access carrier.
In this scheme, the terminal device may obtain in advance a list including all carriers that can support random access, that is, an access carrier information list, which may be broadcast by the receiving system or may be configured in advance on the terminal device, which is not limited to this scheme. In the scheme, the access carrier adopted by the terminal equipment can be determined by the base station according to the first access carrier instead of random selection during the determination of the new second access carrier by the terminal equipment, so that the reserved resource is configured, the conflict between the terminal equipment and other terminal equipment is avoided, and the interference is reduced.
In a specific implementation manner, the determining, by the terminal device, the second access carrier according to the information of the first access carrier and the pre-acquired access carrier information list includes:
the terminal equipment acquires the index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier;
and the terminal equipment determines the second access carrier from the pre-acquired access carrier information list according to the index of the second access carrier.
In another specific implementation manner, the determining, by the terminal device, the second access carrier according to the information of the first access carrier and the access carrier information list includes:
the terminal equipment acquires a first carrier information list from the access carrier information list, wherein the first carrier information list comprises information of carriers supporting a new coverage grade after the terminal equipment promotes the coverage grade;
the terminal equipment acquires the index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier;
and the terminal equipment determines the second access carrier from the first carrier information list according to the index of the second access carrier.
Optionally, the first carrier information list includes information of a non-anchor carrier supporting a new coverage level after the coverage level is raised by the terminal device or information of all carriers supporting the new coverage level after the coverage level is raised by the terminal device.
In the above scheme, a manner is provided in which the terminal device determines the second access carrier according to the first access carrier, and one is to directly calculate an index of the second access carrier according to a preset algorithm according to the index of the first access carrier, and then determine the second access carrier for random access according to the index of the second access carrier in the access carrier information list. The other method is that the access carrier information list is screened, information of all carriers which can support the new coverage grade after the terminal equipment raises the coverage grade is screened out to obtain a first carrier information list, an index of a second access carrier is obtained according to the index of the first access carrier and a preset algorithm, and the second access carrier is determined from the first carrier information list according to the index of the second access carrier; or, screening the access carrier information list, screening information of all non-anchor carriers which can support the new coverage grade after the coverage grade is improved by the terminal equipment, obtaining a first carrier information list, and then determining a second access carrier in the first carrier information list according to the calculated index of the second access carrier, so that the selection of the anchor carrier can be avoided.
On the basis of any one of the above implementation manners, the obtaining, by the terminal device, the index of the second access carrier by using a preset algorithm according to the information of the first access carrier includes:
the terminal device calculates and obtains the index of the second access carrier by adopting the preset algorithm according to the index of the first access carrier, wherein the preset algorithm comprises the following steps: determining the index of a second access carrier according to the index of the first access carrier and the number of all carriers used for the new coverage grade; or determining the index of a second access carrier according to the index of the first access carrier and the number of the non-anchor carriers for the new coverage grade; wherein the information of the first access carrier comprises an index of the first access carrier.
The preset algorithm is that the index of the new access carrier can be determined according to the index of the access carrier designated by the base station and the number of available access carriers.
Optionally, the index of the second access carrier is equal to a remainder of the index of the first access carrier divided by the number of carriers supporting the new coverage class.
If the terminal device determines the second access carrier from the first carrier information list comprising information of all carriers supporting the new coverage class, the index of the second access carrier is equal to the remainder of the index of the first access carrier divided by the number of all carriers supporting the new coverage class.
If the terminal device determines the second access carrier from the first carrier information list including information of all non-anchor carriers supporting the new coverage class, the index of the second access carrier is equal to the remainder of the index of the first access carrier divided by the number of all non-anchor carriers supporting the new coverage class.
Optionally, before the terminal device determines the second access carrier according to the information of the first access carrier and the pre-acquired access carrier information list, the method further includes:
and the terminal equipment receives the access carrier information list broadcasted by the system.
A second aspect of the present application provides a random access apparatus, including:
the processing module is used for determining a second access carrier according to the information of the first access carrier and a pre-acquired access carrier information list; the first access carrier is a carrier which is indicated by a base station and is accessed by the terminal equipment, and the access carrier information list comprises information of carriers supporting random access;
and the access module is used for carrying out random access on the second access carrier acquired by the processing module.
Optionally, the processing module is specifically configured to:
acquiring an index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier;
and determining the second access carrier from the pre-acquired access carrier information list according to the index of the second access carrier.
Optionally, the processing module is specifically configured to:
acquiring a first carrier information list from the access carrier information list, wherein the first carrier information list comprises information of carriers supporting a new coverage grade after the coverage grade is improved by the terminal equipment;
acquiring an index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier;
and determining the second access carrier from the first carrier information list according to the index of the second access carrier.
Optionally, the first carrier information list acquired by the processing module includes information of a non-anchor carrier supporting a new coverage level after the coverage level is raised by the terminal device or information of all carriers supporting the new coverage level after the coverage level is raised by the terminal device.
Optionally, the processing module is specifically configured to:
and calculating and acquiring the index of the second access carrier by adopting the preset algorithm according to the index of the first access carrier, wherein the preset algorithm comprises the following steps: determining the index of a second access carrier according to the index of the first access carrier and the number of all carriers used for the new coverage grade; or determining the index of a second access carrier according to the index of the first access carrier and the number of the non-anchor carriers for the new coverage grade; wherein the information of the first access carrier comprises an index of the first access carrier.
Optionally, the apparatus further comprises:
and the receiving module is used for receiving the access carrier information list broadcasted by the system.
It is to be understood that in the above-described implementation of the random access apparatus, the processing module may be embodied as a processor, and the receiving module may be embodied as a receiver.
A third aspect of the present application provides a terminal device, comprising: a memory, a processor and a computer program, the computer program being stored in the memory, the processor running the random access method according to any of the implementations of the first aspect of the computer program.
In a specific implementation of the above terminal device, the number of the processors is at least one, and the processors are used for executing execution instructions stored in the memory, that is, computer programs. The terminal device is caused to perform the random access method provided by the first aspect or the various embodiments of the first aspect by data interaction between the communication interface and the base station, and optionally, the memory may be further integrated within the processor.
A fourth aspect of the present application provides a storage medium comprising: a readable storage medium and a computer program for implementing the random access method of any one of the first aspect.
A fifth aspect of the present application provides a program product comprising a computer program (i.e. executing instructions), the computer program being stored in a readable storage medium. The computer program may be read from a readable storage medium by at least one processor of the terminal device, and execution of the computer program by the at least one processor causes the terminal device to implement the random access method provided by the various embodiments of the first aspect.
In the random access method, apparatus, device and storage medium provided in this embodiment, the terminal device determines the second access carrier according to the information of the first access carrier that is indicated by the base station and can be accessed and the pre-acquired access carrier information list, where the access carrier information list includes information of all carriers supporting random access, and then the terminal device performs random access on the second access carrier. When the terminal equipment performs random access, a new second access carrier is determined in the access carrier information list according to the first access carrier known by the base station instead of randomly selecting the access carrier, and the base station can also determine the second access carrier adopted by the terminal equipment according to the indicated first access carrier so as to configure the access carriers of other terminal equipment, reduce the collision probability of the terminal equipment and other terminal equipment and avoid interfering the use of other terminal equipment.
Drawings
Fig. 1 is a schematic view of an application scenario of the random access method of the present application;
fig. 2 is a flowchart of a first embodiment of a random access method provided in the present application;
fig. 3 is a schematic structural diagram of a first random access apparatus according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a second random access apparatus according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an embodiment of a terminal device provided in the present application.
Detailed Description
Most random access is to make terminal devices directly and randomly select available resources to initiate according to system broadcast configuration when there is a need, and a base station is responsible for solving conflicts among a plurality of terminal devices generated by the random access. In order to design a Physical Downlink Control Channel (PDCCH) order-triggered random access, the order indicates a used random access resource for the terminal device, that is, for some special scenarios, the base station wants to reduce an access collision probability for some terminal devices. For example, the base station may reserve a part of resources, which are only used for order-triggered random access, and the reserved resources are used by the terminal device in the order, which may greatly reduce the collision probability.
According to the scheme of the background art part, the terminal triggered by the order to perform random access partially changes the coverage grade after failure for several times, and randomly selects a carrier to initiate a new attempt. For these terminal devices, the collision probability will be greatly enhanced because the base station cannot guarantee the randomly selected carrier and the resources correspondingly used on the carrier. For the network or other terminal devices, since these terminal devices may randomly select reserved resources on other carriers, interference may also be caused to the terminal that should use these resources.
The main reason for this is that the carriers selected after changing the coverage class of the terminal device are random and unknown to the base station or uncontrollable. A new carrier selection method for such a scenario needs to be designed, that is, it is ensured that the terminal device can select a carrier supporting a new coverage level, and it is also ensured that the selection has a certain rule and the base station is controllable. Based on this, the present application proposes a new scheme for determining an access carrier, so as to make a base station controllable and reduce interference to other terminal devices.
Fig. 1 is a schematic view of an application scenario of the random access method of the present application. As shown in fig. 1, the random access method provided in the present application may be applied to any wireless communication System, for example, an internet of things System such as an NB-IoT System and an eMTC System that require low complexity and low power consumption of a terminal device, and in addition, a conventional Long Term Evolution (LTE), an evolved Universal Mobile Telecommunications System (UMTS), and the like. Such as the IoT communication system shown in fig. 1, the solution is applicable to various terminal devices that can access a base station for information interaction, and may be a wireless terminal or a wired terminal, where the wireless terminal may be a device that provides voice and/or other service data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). A wireless Terminal may also be called a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), a User Equipment (User Equipment), for example: computers, household appliances, automobiles, televisions and the like. And is not limited herein.
The Base Station referred to in this application is also called a Radio Access Network (RAN) device, which is a device for accessing a terminal to a wireless Network, and may be a Base Station (BTS) in Global System of Mobile communication (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), a Node B (eNB, eNodeB) in Long Term Evolution (Long Term Evolution), a relay Station or an Access point, or a Base Station in a future 5G Network, and the like, but is not limited thereto.
Fig. 2 is a flowchart of a first embodiment of a random access method provided in the present application, and as shown in fig. 2, in an application scenario shown in fig. 1, specific implementation steps of the random access method include:
s101: the terminal equipment determines a second access carrier according to the information of the first access carrier and a pre-acquired access carrier information list; the first access carrier is a carrier which is indicated by the base station and is accessed by the terminal equipment, and the access carrier information list comprises information of carriers supporting random access.
In this step, the first access carrier is a carrier indicated by the base station and used for random access by the terminal device.
When the base station initiates a random access process, the base station indicates parameters such as a coverage level, a subcarrier index and a carrier index used by the terminal equipment, so that the terminal equipment can send a random access preamble sequence by using random access resource configuration corresponding to the coverage level at a position of a corresponding carrier according to the coverage level, the subcarrier index and the carrier index indicated by the base station, and under a normal condition, the terminal equipment receives a random access response returned by the base station. However, due to the coverage level of the terminal device and the influence of other problems, after the terminal device uses the first access carrier for multiple times to perform random access and receives a random access response returned by the base station, the access configuration can be adjusted according to actual situations, for example, the coverage level is improved.
At this time, the terminal device needs to determine a new random access carrier, that is, the second access carrier in the scheme, in the access carrier information list supporting the random access carrier according to the new coverage level after the coverage level is raised.
In the scheme, the terminal equipment does not select the carrier wave in a random selection mode any more, but the new second access carrier wave is confirmed again from the list based on the first access carrier wave indicated by the base station in the access carrier wave information list, so that the base station can also determine the carrier wave possibly adopted by the terminal equipment according to the first access carrier wave to regulate and control to avoid interference.
Optionally, the terminal device may determine the second access carrier according to the first access carrier by using any one of the following manners:
in a first implementation manner, the terminal device obtains an index of a second access carrier by using a preset algorithm according to information of the first access carrier, and the terminal device determines the second access carrier from a pre-obtained access carrier information list according to the index of the second access carrier.
The meaning of the above scheme is that the terminal device determines the index of a new second access carrier according to the information of the first access carrier, and then determines the second access carrier from an access carrier information list according to the determined index of the second access carrier, wherein the access carrier information list can be obtained by broadcasting through the base station. A specific calculation way is to determine the index of the second access carrier according to the index of the first access carrier and the number of all carriers used for the new coverage class, for example: and dividing the index of the first access carrier by the remainder of the number of all carriers supporting the new coverage level to be used as the index of the second access carrier.
In a second implementation manner, a terminal device acquires a first carrier information list from an access carrier information list, where the first carrier information list includes information of a carrier supporting a new coverage level after the terminal device raises the coverage level; the terminal equipment acquires the index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier; and the terminal equipment determines the second access carrier from the first carrier information list according to the index of the second access carrier.
The meaning of the above scheme is: the terminal device first screens the access carrier information list according to certain conditions, and screens out a first carrier information list meeting certain conditions, for example: the first carrier information list includes information of a non-anchor carrier supporting a new coverage level after the terminal device raises the coverage level or information of all carriers supporting the new coverage level after the terminal device raises the coverage level. That is, information of all carriers that can support the new coverage class of the terminal device in the access carrier information list may be screened out to form a new first carrier information list, or information of all non-anchor carriers that can support the new coverage class of the terminal device in the access carrier information list may be screened out to form a new first carrier information list. The terminal device then determines a second access carrier from the first carrier information list.
Specifically, the terminal device obtains an index of the second access carrier according to an index in the information of the first access carrier. The obtaining manner may be to determine an index of a second access carrier according to the index of the first access carrier and the number of all carriers used for the new coverage class, or to determine an index of a second access carrier according to the index of the first access carrier and the number of non-anchor carriers used for the new coverage class.
Optionally, the determining manner of the index of the second access carrier provided by the present application is:
if the terminal device determines the second access carrier from the first carrier information list comprising information of all carriers supporting the new coverage class, the index of the second access carrier is equal to the remainder of the index of the first access carrier divided by the number of all carriers supporting the new coverage class.
If the terminal device determines the second access carrier from the first carrier information list including information of all non-anchor carriers supporting the new coverage class, the index of the second access carrier is equal to the remainder of the index of the first access carrier divided by the number of all non-anchor carriers supporting the new coverage class.
S102: and the terminal equipment performs random access on the second access carrier.
In this step, after determining the second access carrier, the terminal device performs random access according to the new second access carrier, and may send a random access preamble sequence to the base station according to the new coverage class and the second access carrier, so as to complete the random access process.
If the terminal device receives a Random Access Response (RAR) returned by the base station, the Access is successful.
Otherwise, the random access procedure can be continued according to the above procedure.
In a specific implementation of the foregoing scheme, the access carrier information list may be obtained by receiving a system broadcast before the terminal device determines the second access carrier according to the information of the first access carrier and the pre-acquired access carrier information list.
In the random access method provided in this embodiment, the terminal device determines the second access carrier according to the information of the first access carrier that is indicated by the base station and can be accessed and the pre-acquired access carrier information list, where the access carrier information list includes information of all carriers supporting random access, and then the terminal device performs random access on the second access carrier. When the terminal equipment performs random access, a new second access carrier is determined in the access carrier information list according to the first access carrier known by the base station instead of randomly selecting the access carrier, and the base station can also determine the second access carrier adopted by the terminal equipment according to the indicated first access carrier so as to configure the access carriers of other terminal equipment, reduce the collision probability of the terminal equipment and other terminal equipment and avoid interfering the use of other terminal equipment.
On the basis of the above-mentioned embodiments, several specific processes are provided below to further explain the present solution.
The first implementation scheme is as follows:
for the random access triggered by the PDCCH order, after the terminal device fails to try for several times, the coverage level may be raised, and then a new access Carrier (first access Carrier) is determined according to the Carrier _ index (index of the first access Carrier) in the original PDCCH order, and then random access is performed on the new access Carrier. Specifically, according to the carrier configuration in the system broadcast, carriers that can be used for improving the current coverage level after the coverage level are selected from the carrier configuration according to the carrier sequence in the configuration, so as to form a new carrier list (i.e., a first carrier information list);
the new carrier index is calculated by the following formula:
carrier _ index _ new ═ Carrier _ index mod the number of carriers available for the current coverage class; where mod represents the remainder operation. A new random access Carrier is then determined in the new Carrier list using Carrier _ index _ new.
In the above scheme, the new carrier list may include information of all carriers supporting the new coverage class, or may include only information of non-anchor carriers supporting the new coverage class. Since part of the terminal devices (e.g., R-13 type terminals) can only access the anchor carrier (anchor carrier), which may have a large load, the anchor carrier is considered to be avoided from being used during reselection, so as to avoid further increase of the load on the anchor carrier.
The second implementation scheme is as follows:
for PDCCH order triggered random access, the coverage level may be raised when the terminal device fails several times. The terminal equipment determines a new access Carrier (a second access Carrier) according to a Carrier _ index (namely, an index of the first access Carrier) in the PDCCH order of the base station, and then performs random access on the new access Carrier.
For example, determining a new access carrier may specifically calculate a new carrier index by the following formula:
carrier _ index _ new ═ Carrier _ index mod the number of carriers available for the current coverage class; where mod represents the remainder operation. Then, a new random access Carrier is determined in a Carrier list of the system broadcast configuration by using Carrier _ index _ new: for example: the index value 0 represents the first carrier in the list available for random access at the current coverage level and the value 1 represents the second carrier in the list available for random access at the current coverage level.
In this method, the carriers after the change of the coverage level of the terminal device are not randomly selected, the selection method and the corresponding formula are defined by a protocol, and the base station knows which new carrier will be used when the terminal changes the coverage level. Therefore, the base station can avoid corresponding interference through configuration.
In the process of cell reselection (inter-freq terminal ncy cell re-selection) of the terminal equipment, in order to increase the reselection of the terminal equipment to the cell at the frequency point supporting the multicast service, an offset Qoffset for the frequency point supporting the multicast service is introduced in the related calculationSCPTMHowever, this offset only occurs in the neighbor correlation calculation, i.e., the following RnThe method comprises the following steps:
Rs＝Qmeas,s+QHyst-Qoffsettemp
Rn＝Qmeas,n-Qoffset-Qoffsettemp
wherein R issFor serving cell, RnFor other purposesAnd (5) neighbor cells. Newly introduced QoffsetSCPTMIs included only in the calculation of Qoffset. The cell reselection condition at reselection is at Rn>RsSelects the most suitable cell to camp on. When the reselection is completed, the terminal resides on a cell on a frequency point supporting the multicast service, and the cell supporting the multicast service is changed from a previous target adjacent cell to a serving cell because of RsNo longer contains QoffsetSCPTMAt this time, if the frequency points of other neighboring cells also support the related multicast service, the terminal may reselect to these cells again, that is, a "ping-pong effect" is generated.
To avoid the "ping-pong effect", this example:
and simultaneously applying the offset of the multicast service to corresponding calculation of the service cell and the adjacent cell.
One possible way of calculation is:
Rs＝Qmeas,s+QHyst-Qoffsettemp+QoffsetSCPTM
Rn＝Qmeas,n-Qoffset-Qoffsettemp+QoffsetSCPTM
that is, QoffsetSCPTMThe increase shown to R is an independent offsetsAnd RnIn the calculation of (2). In order to make the terminal device select the cell/frequency point supporting the multicast service as much as possible, the value of the offset is a non-negative value or a positive value;
another calculation method is as follows:
Rs＝Qmeas,s+QHyst-Qoffsettemp-QoffsetSCPTM
Rn＝Qmeas,n-Qoffset-Qoffsettemp-QoffsetSCPTM
that is, QoffsetSCPTMAs an independent offset, the addition shown adds to the calculation of Rs and Rn. In order to make the terminal device select the cell/frequency point supporting the multicast service as much as possible, the value of the offset is a non-positive value or a negative value;
in addition, the offset may also be used as an implicit offset, and the value of the offset is implicitly added to the existing offset, for example, in the third calculation method:
Rs＝Qmeas,s+QHyst-Qoffsettemp
Rn＝Qmeas,n-Qoffset-Qoffsettemp
in the calculation of the serving cell, Q if an offset for multicast existsHystHas a value of QHystAdding a multicast offset, such as QoffsetSCPTM, or the value of qoffsetemp is the value of qoffsetemp plus or minus the multicast offset, such as QoffsetSCPTM, in this case, the value of the multicast offset may be a non-positive value, a non-negative value, a positive value, a negative value, or one of them.
In the calculation of the neighbor cell, if the multicast offset exists, Qoffset is setfrequencyValue of QoffsetfrequencyPlus QoffsetSCPTMThe value of (c). Qoffset at this timeSCPTMIs a non-positive value, or a negative value.
Similarly, other indication and implicit indication modes are as follows, in the calculation of the serving cell, the multicast offset exists as a display, and in order to make the terminal device select the cell/frequency point supporting the multicast service as much as possible, the value of the offset is a non-negative value or a positive value;
and in the calculation of the adjacent region, the multicast offset exists as an implicit expression. The implicit existence of the neighboring cell is the same as the implicit expression of the neighboring cell calculation. That is, in the calculation of the neighboring cell, if an offset amount of multicast exists, Qoffset is setfrequencyValue of QoffsetfrequencyPlus QoffsetSCPTMThe value of (c). Qoffset at this timeSCPTMIs a non-positive value, or a negative value. And the calculation method is as follows:
Rs＝Qmeas,s+QHyst-Qoffsettemp+QoffsetSCPTM
Rn＝Qmeas,n-Qoffset-Qoffsettemp
similarly, other indication and implicit indication modes are as follows, in the calculation of the serving cell, the multicast offset exists as a display, and in order to make the terminal device select the cell/frequency point supporting the multicast service as much as possible, the value of the offset is a non-positive value or a negative value;
and in the calculation of the adjacent region, the multicast offset exists as an implicit expression. The implicit existence of the neighboring cell is the same as the implicit expression of the neighboring cell calculation. That is, in the calculation of the neighboring cell, if an offset amount of multicast exists, Qoffset is setfrequencyValue of QoffsetfrequencyPlus QoffsetSCPTMThe value of (c). Qoffset at this timeSCPTMIs a non-positive value, or a negative value. And a fifth calculation mode:
Rs＝Qmeas,s+QHyst-Qoffsettemp-QoffsetSCPTM
Rn＝Qmeas,n-Qoffset-Qoffsettemp
in addition, the offset is used to make many terminal equipments reside on the frequency point supporting some multicast services, and after the multicast service of the frequency point where the terminal equipment is located is finished, if the quality of the serving cell is good, the terminal will not trigger the cell reselection service. This results in a large number of terminals residing at the frequency point, which may result in a heavy load at the frequency point, which is not favorable for load balancing of the network.
In the current measurement rule for cell reselection, in order to limit the measurement of the terminal device in the idle state, two measurement thresholds are defined in the system message: one is the same frequency measurement threshold: sIntraSearchPAnd a pilot frequency measurement threshold SnonIntraSearchPWhen the measurement amount of the serving cell is higher than the corresponding threshold, the terminal device does not perform the corresponding measurement. For example, when the threshold of the serving cell is higher than the co-frequency measurement threshold, Srxlev>SIntraSearchPAnd the terminal equipment can choose not to execute the same-frequency measurement. When the threshold value of the serving cell is higher than the pilot frequency measurement threshold value, Srxlev>SnonIntraSearchPThe terminal device may choose not to perform inter-frequency measurements.
In order to solve the problem that the terminal stays in the serving cell and does not trigger the neighbor cell measurement after the multicast service is finished, so that the terminal device can reselect to other frequency points/cells for residence. The method specifically comprises the following steps:
measurement threshold S for terminal device to ignore co-frequency cellsIntraSearchP: after the multicast service technology, the terminal equipment ignores the same-frequency measurement threshold value and starts the same-frequency measurement;
or the terminal device ignores the measurement threshold S of the inter-frequency cellnonIntraSearchP: after the multicast service technology, the terminal equipment ignores the pilot frequency measurement threshold value and starts pilot frequency measurement;
or the terminal device ignores the measurement threshold S of the co-frequency cellIntraSearchPAnd pilot frequency measurement threshold SnonIntraSearchP: after the multicast service technology, the terminal equipment ignores the same-frequency measurement threshold and the different-frequency measurement threshold, and starts the same-frequency measurement and the different-frequency measurement.
Fig. 3 is a schematic structural diagram of a first embodiment of a random access apparatus provided in the present application, and as shown in fig. 3, the random access apparatus 10 includes:
the processing module 11 is configured to determine a second access carrier according to the information of the first access carrier and a pre-acquired access carrier information list; the first access carrier is a carrier which is indicated by a base station and is accessed by the terminal equipment, and the access carrier information list comprises information of carriers supporting random access;
an access module 12, configured to perform random access on the second access carrier acquired by the processing module 11.
The random access apparatus provided in this embodiment is used to implement the technical solution on the terminal device side in any of the foregoing method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.
On the basis of the foregoing embodiment, the processing module 11 is specifically configured to:
acquiring an index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier;
and determining the second access carrier from the pre-acquired access carrier information list according to the index of the second access carrier.
Optionally, the processing module 11 is specifically configured to:
acquiring a first carrier information list from the access carrier information list, wherein the first carrier information list comprises information of carriers supporting a new coverage grade after the coverage grade is improved by the terminal equipment;
acquiring an index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier;
and determining the second access carrier from the first carrier information list according to the index of the second access carrier.
Optionally, the first carrier information list acquired by the processing module 11 includes information of a non-anchor carrier supporting a new coverage level after the coverage level is raised by the terminal device or information of all carriers supporting the new coverage level after the coverage level is raised by the terminal device.
Optionally, the processing module 11 is specifically configured to:
and calculating and acquiring the index of the second access carrier by adopting the preset algorithm according to the index of the first access carrier, wherein the preset algorithm comprises the following steps: determining the index of a second access carrier according to the index of the first access carrier and the number of all carriers used for the new coverage grade; or determining the index of a second access carrier according to the index of the first access carrier and the number of the non-anchor carriers for the new coverage grade; wherein the information of the first access carrier comprises an index of the first access carrier.
Fig. 4 is a schematic structural diagram of a second random access apparatus according to an embodiment of the present application, and as shown in fig. 4, on the basis of any of the foregoing schemes, the random access apparatus 10 further includes:
a receiving module 13, configured to receive the access carrier information list broadcasted by the system.
The random access apparatus provided in this embodiment is used to implement the technical solution on the terminal device side in any of the foregoing method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.
Fig. 5 is a schematic structural diagram of an embodiment of a terminal device provided in the present application, and as shown in fig. 5, the terminal device includes: a memory, a processor and a computer program, the computer program being stored in the memory, the processor running the computer program to implement the random access method provided by any of the foregoing embodiments.
In a specific implementation of the above terminal device, the number of the processors is at least one, and the processors are used for executing execution instructions stored in the memory, that is, computer programs. The terminal device is caused to perform the random access method provided by the first aspect or the various embodiments of the first aspect by data interaction between the communication interface and the base station, and optionally, the memory may be further integrated within the processor.
Optionally, the terminal device may further include a transmitter, a receiver, and the like.
The present application also provides a storage medium comprising: a readable storage medium and a computer program for implementing the random access method provided by any of the foregoing embodiments.
The present application also provides a program product comprising a computer program (i.e. executing instructions), the computer program being stored in a readable storage medium. The computer program may be read from a readable storage medium by at least one processor of the terminal device, and the computer program may be executed by the at least one processor to cause the terminal device to implement the random access method provided by the foregoing various embodiments.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The aforementioned program may be stored in a computer-readable memory. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned memory (storage medium) includes: read-only memory (ROM), RAM, flash memory, hard disk, solid state disk, magnetic tape (magnetic tape), floppy disk (optical disk), and any combination thereof.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same.
Claims (6)
1. A random access method, comprising:
the terminal equipment determines a second access carrier according to the information of the first access carrier and a pre-acquired access carrier information list; the first access carrier is a carrier which is indicated by a base station and is accessed by the terminal equipment, and the access carrier information list comprises information of carriers supporting random access;
the terminal equipment carries out random access on the second access carrier;
the terminal equipment determines a second access carrier according to the information of the first access carrier and a pre-acquired access carrier information list, and the method comprises the following steps:
the terminal equipment acquires the index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier;
the terminal equipment determines the second access carrier from the pre-acquired access carrier information list according to the index of the second access carrier;
the method for acquiring the index of the second access carrier by the terminal equipment by adopting a preset algorithm according to the information of the first access carrier comprises the following steps:
the terminal device calculates and obtains the index of the second access carrier by adopting the preset algorithm according to the index of the first access carrier, wherein the preset algorithm comprises the following steps: determining the index of a second access carrier according to the index of the first access carrier and the number of all carriers for the new coverage grade; or determining the index of a second access carrier according to the index of the first access carrier and the number of the non-anchor carriers for the new coverage grade; wherein the information of the first access carrier comprises an index of the first access carrier;
and the new coverage grade is the coverage grade after the coverage grade is improved by the terminal equipment.
2. The method of claim 1, wherein before the terminal device determines the second access carrier according to the information of the first access carrier and the pre-acquired access carrier information list, the method further comprises:
and the terminal equipment receives the access carrier information list broadcasted by the system.
3. A communications apparatus, comprising:
the processing module is used for determining a second access carrier according to the information of the first access carrier and a pre-acquired access carrier information list; the first access carrier is a carrier accessed by the terminal equipment indicated by the base station, and the access carrier information list comprises information of carriers supporting random access;
the access module is used for carrying out random access on the second access carrier acquired by the processing module;
the processing module is specifically configured to:
acquiring an index of the second access carrier by adopting a preset algorithm according to the information of the first access carrier;
determining the second access carrier from the pre-acquired access carrier information list according to the index of the second access carrier;
the processing module is specifically configured to:
and calculating and acquiring the index of the second access carrier by adopting a preset algorithm according to the index of the first access carrier, wherein the preset algorithm comprises the following steps: determining the index of a second access carrier according to the index of the first access carrier and the number of all carriers for the new coverage grade; or determining the index of a second access carrier according to the index of the first access carrier and the number of the non-anchor carriers for the new coverage grade; wherein the information of the first access carrier comprises an index of the first access carrier;
and the new coverage grade is the coverage grade after the coverage grade is improved by the terminal equipment.
4. The apparatus of claim 3, further comprising:
and the receiving module is used for receiving the access carrier information list broadcasted by the system.
5. A communications apparatus, comprising: memory, a processor and a computer program, the computer program being stored in the memory, the processor running the computer program to perform the random access method of claim 1 or 2.
6. A storage medium, comprising: a readable storage medium and a computer program for implementing the random access method of claim 1 or 2.
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| PCT/CN2017/078185 WO2018170919A1 (en) | 2017-03-24 | 2017-03-24 | Random access method and apparatus, device, and storage medium |
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| Publication number | Publication date |
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| WO2018170919A1 (en) | 2018-09-27 |
| CN110463331A (en) | 2019-11-15 |
| EP3582574A1 (en) | 2019-12-18 |
| KR102271492B1 (en) | 2021-06-30 |
| KR20190124765A (en) | 2019-11-05 |
| US20200022184A1 (en) | 2020-01-16 |
| EP3582574A4 (en) | 2020-03-04 |
| EP3582574B1 (en) | 2023-07-12 |
| JP7060611B2 (en) | 2022-04-26 |
| JP2020515183A (en) | 2020-05-21 |
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